What type of test is performed to confirm a diagnosis of myopia?

To confirm a diagnosis of myopia, the Snellen eye chart test is employed. This test measures visual acuity at a distance by requiring the patient to read letters or symbols on the chart from a specific distance. Myopia, commonly known as nearsightedness, is characterized by difficulty seeing distant objects clearly, while close objects can be seen well. The Snellen chart helps to quantify this visual acuity, making it possible to determine the degree of myopia based on the smallest line of letters the patient can read accurately.

The other types of tests mentioned do not specifically assess myopia. Visual field tests measure the range of vision and are used to detect blind spots or peripheral vision issues. Pupil reaction tests evaluate how the pupils react to light and accommodation but do not provide information on refractive errors like myopia. Color vision tests assess the ability to distinguish different colors and are not used to diagnose refractive vision issues.